net: ipv6: Fix compiler warning

Fix the following compiler warning (also a checkpatch error):

net/ipv6/xfrm6_mode_tunnel.c: In function ‘xfrm6_mode_tunnel_input’:
net/ipv6/xfrm6_mode_tunnel.c:72:2: warning: suggest parentheses around assignment used as truth value [-Wparentheses]

---
 net/ipv6/xfrm6_mode_tunnel.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

index 93c41a8..9bf6a74 100644
@@ -69,7 +69,8 @@ static int xfrm6_mode_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
 	if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
 		goto out;
 
-	if (err = skb_unclone(skb, GFP_ATOMIC))
+	err = skb_unclone(skb, GFP_ATOMIC);
+	if (err)
 		goto out;
 
 	if (x->props.flags & XFRM_STATE_DECAP_DSCP)

1.8.1.2

Patches to fix this have already been applied to net-next, thanks.